The fraction of the annulus defined by the inner/outer radius r_in/r_out, which is covered by the extraction region of each instrument. For cross-calibration purposes, the measured fluxes must be divided by the numbers in table in order to extrapolate the fluxes to the full annulus.
Cluster r_in r_out XMM-Newton/pn XMM-Newton/MOS Chandra/ACIS
arcmin arcmin
A1795 1.5 2.7 0.88 1.00 1.00
A2029 1.5 2.5 0.89 1.00 1.00
A2052 1.7 2.5 0.87 0.98 1.00
A2199 2.0 2.9 0.82 0.93 1.00
A262 1.6 2.7 0.79 0.91 1.00
A3112 1.5 2.9 0.83 0.95 1.00
A3571 0.0 2.1 0.88 0.94 1.00
A85 1.5 3.0 0.85 0.86 0.84
Coma 1.0 5.0 0.93 0.97 0.88
HydraA 1.5 2.7 0.78 0.86 1.00
MKW3S 1.5 2.5 0.89 1.00 1.00